Roll forming method for forming flat tube and roll forming appar

Details Roll forming method for forming flat tube and roll forming appar Roll forming method for forming flat tube and roll forming appar

1997-09-15

1999-03-02

Crane, Daniel C.

Metal deforming

By deflecting successively-presented portions of work during...

By use of deflector arranged to bend work transversely of...

72 52, 29890053, 138115, B21D 512

Patent

active

058756680

ABSTRACT:
According to the present invention, a roll forming method includes a first roll forming process for forming a trapezoidal projecting portion at a center portion, a second roll forming process for gradually narrowing an upper side of the trapezoidal projecting portion to form a turnup projecting portion, a third roll forming process for forming perpendicularly folded portions at both sides, and a fourth roll forming process for folding a middle portion between the perpendicularly folded portion and the turnup projecting portion in a semi-circular shape. In this way, it is possible to form a turnup projecting portion, insides of which are closely contacted to each other with a curvature which is larger than the conventional curvature, with high speed.

REFERENCES:
patent: 455621 (1891-07-01), Hicks
patent: 2655181 (1953-10-01), Cooper
patent: 3707088 (1972-12-01), King
patent: 4085490 (1978-04-01), McCormick
patent: 5386629 (1995-02-01), Ouchi

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